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耐高温α-淀粉酶高密度高表达发酵条件的优化

作  者:
胡建恩;曹茜;杨帆;房耀维;王淑军;吕明生;葛亮;李瑛
单  位:
上海海洋大学食品学院;淮海工学院海洋学院;大连海洋大学食品科学与工程学院;江南大学生物工程学院
关键词:
耐高温α-淀粉酶;大肠杆菌BL21;发酵培养基;发酵条件
摘  要:
通过摇瓶实验对产耐高温α-淀粉酶的重组菌E.coli BL21的高密度高表达发酵条件进行研究。考察不同培养基和不同发酵条件对该菌株产耐高温α-淀粉酶的影响,并利用正交试验进行优化。结果表明:在葡萄糖0.5g/L,酵母粉15g/L,pH6.5,诱导时机为接种后发酵4h,诱导时间为6h,IPTG添加量为0.8mmol/L,接种量为体积分数3%的优化条件下,该重组菌发酵液菌体生物量为原来的1.29倍,酶活力达到8.754U/mL,是原来的1.55倍,目的蛋白的表达量也为原来的1.24倍。
译  名:
Optimization of Fermentation Conditions for High Cell Density Cultivation and High Hyperthermophilic α-Amylase Expression in Recombinant E.coli
作  者:
HU Jian-en1,CAO Qian1,2,YANG Fan1,2,FANG Yao-wei2,WANG Shu-jun2,, LU..Ming-sheng2,GE Liang3,LI Ying4(1.College of Food Science and Engineering,Dalian Ocean University,Dalian 116023,China;2.School of Marine Science,Huaihai Institute of Technology,Lianyungang 222005,China;3.College of Food Science and Technology,Shanghai Ocean University,Shanghai 201306,China;4.School of Biothechnology,Jiangnan University,Wuxi 214122,China)
关键词:
hyperthermophilic α-amylase;E.coli BL21;cultivation medium;cultivation conditions
摘  要:
In order to achieve high-cell-density cultivation and high expression of recombinant E.coli BL21 producing hyperthermophilic α-amylase,the medium composition and shake flask fermentation conditions were optimized using orthogonal array design.The optimal cultivation conditions for the production of α-amylase were achieved by using a pH 6.5 medium composed of 0.5 g/L glucose and 15 g/L yeast extract and an inoculum size of 3%,and adding 0.8 mmol/L IPTG for 6 h induction after 4 h of fermentation.Under these conditions,the biomass of recombinant E.coli BL21 was increased by 1.29-fold,the α-amylase activity by 1.55-fold(reaching 8.754 U/mL) and the protein expression level by 1.24-fold compared to the pre-optimization results.

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